Shift data to operate on specified dimension
Shift data in to permute the dimension dimx to the first column.
shiftdata(x, dimx)
x |
The data to be shifted. Can be of any type. |
dimx |
Dimension of |
shiftdata(x, dimx) shifts data x to permute dimension
dimx to the first column using the same permutation as the built-in
filter function. The vector perm in the output list returns the
permutation vector that is used.
If dimx is missing or empty, then the first nonsingleton dimension is
shifted to the first column, and the number of shifts is returned in
nshifts.
shiftdata is meant to be used in tandem with unshiftdata, which
shifts the data back to its original shape. These functions are useful for
creating functions that work along a certain dimension, like
filter, sgolayfilt, and sosfilt.
A list containing 3 variables; x, the shifted data,
perm, the permutation vector, and nshifts, the number of
shifts
Georgios Ouzounis, ouzounis_georgios@hotmail.com.
Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com.
## create a 3x3 magic square x <- pracma::magic(3) ## Shift the matrix x to work along the second dimension. ## The permutation vector, perm, and the number of shifts, nshifts, ## are returned along with the shifted matrix. sd <- shiftdata(x, 2) ## Shift the matrix back to its original shape. y <- unshiftdata(sd) ## Rearrange Array to Operate on First nonsingleton Dimension x <- 1:5 sd <- shiftdata(x) y <- unshiftdata(sd)
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